Remove beepSemaphore extern declaration after semaphore-to-task-notification refactor

src/InterruptHandler.h

@@ -23,8 +23,7 @@ typedef struct {
     bool     pinValue;
 } RfEvent_t;
 
-extern SemaphoreHandle_t beepSemaphore; /* given every ISR_TIME_US to wake beepTask */
-extern QueueHandle_t     rfEventQueue;  /* RF pulse events for rfDecodeTask */
+extern QueueHandle_t rfEventQueue; /* RF pulse events for rfDecodeTask */
 
 void InterruptHandler_Init(void);
 void InterruptHandler_PauseReceive();